You can find GMs that offer this service in a variety of places. Reddit & discord included. I have used the following website successfully in the past, for a few sessions, to try out a specific system. https://startplaying.games/. Source: 6 months ago

I am starting a new run of the Kingmaker module starting on Friday, 1/5/24. Game will run every Friday at 6:30 PM Easter Time US. Game sessions are $20, right around the average price of games on startplaying.games . Source: 6 months ago

Requirements: A discord account with a working mic, a roll20 account, and an account on startplaying.games. Source: 8 months ago

There's also various mediums online such as the subreddit r/lfg and sites such as roll20 and startplaying.games. Can also check facebook and other social media type sites. Source: 8 months ago

Due to some other systems I play, I've used startplaying.games in the past. I'm always searching for Cortex games, but never find any. This might be due to the fact that of all the games I see in the dropdown menu (including new and old, and several relatively obscure games like Marvel Heroic Roleplaying, Mistborn and Root), there isn't a menu selection for Cortex. Why is that? Is this something that official... Source: 9 months ago

I do agree the SEC needs to do something along testing/practical matters, not just the Series 65, which I know some firms are looking into. Check out Doriot. Source: about 1 year ago